This complex caldera
is composed of several discrete centers of collapse where the older
collapse features are cross-cut by more recent collapse events. The
lowermost circular floor preserves the last lava flooding event that
followed the last major collapse. The southern wall of the caldera has
at least 3 kilometers (1.9 miles) of vertical relief with an average
slope of at least 26° (from horizontal). The caldera complex
truncates several lava flows, indicating that the flows predate the
collapse event and that their source areas have been destroyed by the
caldera formation.